By the end of “WAP,” the new single by Cardi B and Megan Thee Stallion (even if you listen to the “radio edit” that is technically not profane but no less NSFW) you will clock that “macaroni in a pot” is not about food and a “bottom feeder” has little to do with fish. But you will have known from the first bass beat that maybe had you dancing in your kitchen with a wet bucket and a mop — you’re probably now asking yourself if that’s a metaphor, too — that the song was a glorious gender role reversal and the triumph of delicious filth.